Biological evidence is any known or questionable bodily fluids or tissues found at the scene or related to the act of an alleged crime. This can include: blood, semen, saliva, bone, hair, and skin. All biological evidence needs to be handled with caution as some fluids, such as blood, can be potentially infectious. Therefore, safety precautions such as wearing proper PPE including puncture resistant gloves, avoiding hand to face contact, and identifying all biohazardous materials is important to follow. Wearing proper PPE also helps prevent any contamination to the evidence. To further prevent contamination/degradation, all biological evidence should be air dried and stored in paper packaging. Even though it is not visible, firearms and other objects of evidence may be swabbed for potential touch DNA, another reason wearing gloves is important while handling all evidence.